nodes can prune transactions, and nodes can (and do) go off…

nodes can prune transactions, and nodes can (and do) go offline. a goal here is to provide a piece of data infrastructure others can use to build from. you're correct though, if a full node offers this, the data could be retrieved, but i've seen a handful of indexers disappear already. JungleBus is good and WhatsOnChain have been doing well here.